Dual-purpose dam

Designed for 100-year storms, the new dam has a double concrete weir and earthen embankments. Water flows through a 3-foot primary weir during normal weather. During storms, the lake stores an additional 522,750 cubic feet of water before overtopping the secondary, 70-foot-wide weir. Cascade blocks on the downstream side slow velocity, minimizing erosion and increasing dissolved oxygen levels for fish and macroinvertebrate. Photo: Merrie Carlock

The 42-acre preserve is home to great blue herons, cormorants, owls, red-tailed hawks, and waterfowl as well as red fox, mink, and deer. One of the few sites in southeast Oakland County with open water and wooded canopy, the preserve is a feeding and resting site for migrating songbirds and waterfowl as they pass over metropolitan Detroit. Map: Johnson Hill Land Ethics Studio

The 90-foot dam is anchored by pilings driven 40 feet deep. Once formwork was finished, concrete was piped into the forms. Photo: Merrie Carlock

Engineers used the dredging process to mimic the profile of a natural lake. Though on average 8 feet deep, some points are 10 to 12 feet. Sand spawning beds and native wetland plants on shallow shelves along the margins house turtles and shorebirds. Photo: Merrie Carlock

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